Documentation: add MIPS Creator CI20 board mini-howto

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
net: dm9k: show only one phy on miibus

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
net: dm9k: fix copy-paste typo

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
net: dm9k: add device tree support

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
MIPS: img-ci20: enable dm9000 ethernet controller

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>